background
x
loader
Troubleshooting
arrow By ATA By Message Color By Observed Faults By CAIMS By Tips

Select color for CAS message that you wish to troubleshoot

(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

This page includes :

For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

11/21/25

Message Overview:

Message Name:

[CPC1] OUTFLOW VALVE #1

Message Code:

2137317ABG

Associated CAS:

AUTO PRESS FAIL
(Caution)

AUTO PRESS FAULT
(Advisory)

MAN PRESS FAULT
(Advisory)

OUTFLOW VLV 1 FAIL
(Advisory)

Reporting LRU: Cabin Pressure Controller 1
System Description: 21-31-00- Cabin Pressure Control System
Schematic Diagram: [ Global Express ]  [ G5000 ]  [ Global XRS ] 21-31-00  Cabin Pressure Control System
Wiring Diagram: [ Global Express ]  [ G5000 ]  [ Global XRS ] 21-31-0 3 Cabin Pressure Control System

Message Description:

During PBIT, the Outflow Valve (OFV) 1 does not respond to test command from Cabin Pressure Controller (CPC) 1. Inhibited during Take-off and Landing.

Possible Causes:

  • Cabin Pressure Controller (CPC) 1 (A21)
  • FWD Outflow Valve (OFV) 1 (L8)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None

NOTES:

  • CPC in control alternate between CPC 1 and CPC 2 

    • CPC1 is used for odd days.
    • CPC2 is used for even days

Quick Links:

Removal of the Cabin Pressure Controllers AMM 21-31-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Cabin Pressure Controllers AMM 21-31-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Outflow Valves AMM 21-31-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Outflow Valves AMM 21-31-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Initiate an IBIT from CPC1. (CPC1 is used for odd days. CPC2 is used for even days). If test passes with CPC1, Interchange CPC1 and CPC2. If problem follows, replace the defective LRU.
  2. Perform wiring checks between CPC1 (A21P1) and Outflow valve 1 (L8P1).

    1. If wiring checks are not good, repair defective associated wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  3. Perform wiring checks between CPC 1 and the cockpit Pressurization Control Panel using SSM 21-31-00.

    1. If wiring checks are not good, repair defective associated wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  4. Using SSM 21-31-00, perform wiring checks on the cockpit Pressurization Control Panel side of connectors AP9J1 and AP9J2. Make sure to check Outflow Valve 1 pushbutton (SDS2), Dump Relay 1 (K1) and ALT Limit Relay 1 (K2) for proper operation.

    1. If defects are found, repair/replace defective component as required.
    2. If checks are good, continue with next step.

  5. Replace Outflow Valve 1.
  6. Do close out.

Registered and/or unregistered trademarks of Bombardier Inc. or its subsidiaries. © 2015 Bombardier Inc. All rights reserved.